Knurled Screw Mufflers | McMaster-Carr

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8 Products

Matching Flow Diagrams to Replace an Air Directional Control Valve

Choosing an Air Directional Control Valve

About Flow Control Valves

Also known as cylinder speed controls, flow control valves let you control the extension or retraction speed of your air cylinder. They regulate airflow as it passes from the valve's inlet to its outlet. Air flows freely in the opposite direction.

Flow-Control Mufflers

Adjust the flow by turning the screw. Use these mufflers with air-powered tools and cylinders to reduce noise and filter exhaust fumes.

For mufflers with a thumb screw, twist the screw and friction secures them in place—no need to use a wrench. Often used in valve exhaust ports, these mufflers are not as secure as those with a nut.

Brass, bronze, and nylon mufflers offer good corrosion resistance.

For technical drawings and 3-D models, click on a part number.

Mufflers with Thumb Screw

NPT Bronze with Thumb Screw

NPT Male Bronze Fitting
Pipe Size	Max. Flow Rate	Max. Pressure, psi	Max. Temp., °F	Ht.	For Use With	Removes Particle Size Down To, microns	Noise Reduction Rating, dBA	Features		Each
1/8	6 scfm @ 100 psi	215	570°	1 1/16"	Air, Inert Gas	35	17-20	Adjustable Airflow, Friction Lock	0000000	00000
1/8	6 scfm @ 100 psi	215	570°	1 3/8"	Air, Inert Gas	35	17-20	Adjustable Airflow, Friction Lock	0000000	0000
1/4	9 scfm @ 100 psi	215	570°	1 3/16"	Air, Inert Gas	35	17-20	Adjustable Airflow, Friction Lock	0000000	0000
1/4	9 scfm @ 100 psi	215	570°	1 9/16"	Air, Inert Gas	35	17-20	Adjustable Airflow, Friction Lock	0000000	0000

Air-Exhaust Flow Control Valves

Thumb Screw Flow Adjustment

Install these valves in the exhaust ports of air directional control valves to control exhaust air speed without needing access to your cylinder. They control flow in one direction as air moves from the inlet to the exhaust port (meter out). Air flows freely in the opposite direction. Valves exhaust to the atmosphere and include a muffler to reduce the exhaust noise.

Flow coefficient (Cv) is a measurement that indicates how much airflow can pass through a valve. When selecting between valves with the same port size, choose the valve with the higher flow coefficient to ensure it provides enough airflow to operate your system.

For technical drawings and 3-D models, click on a part number.

							Overall
No. of Flow Ports	Inlet Size	Max. Flow Rate, scfm @ 100 psi	Flow Coefficient (Cv)	Max. Pressure, psi	Body Material	Hex Size	Dia.	Lg.		Each
Threaded Male Inlet
Thumb Screw Flow Adjustment Mechanism
2	1/8 BSPT	10.59	0.201	145	Brass	10mm	14mm	35.8mm	00000000	000000
2	1/4 BSPT	17.66	0.313	145	Brass	14mm	18mm	37mm	00000000	00000
2	M5 Metric	3.35	0.06	145	Brass	8mm	10mm	23.4mm	00000000	00000
2	M7 Metric	4.24	0.075	145	Brass	8mm	10mm	26.9mm	00000000	00000